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Houston, J.E.: Thesaurus of ERIC (Educational Resources Information Center) descriptors : 14th ed. (2001) 0.03

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Root thesaurus. Pt.1.2 (1985) 0.02

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Date: 18. 5.2007 14:22:43

Standard-Thesaurus Wirtschaft online (2009) 0.01

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Date: 21.11.2011 11:41:22

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